mysql 自定义函数

#获取job的时间详情DROP FUNCTION IF EXISTS `get_job_actual_work_time`;DELIMITER $$CREATE FUNCTION `get_job_actual_work_time`(    in_job_id char(50),    in_action char(50)) RETURNS INT(10)BEGIN      DECLARE out_times INT(10) DEFAULT 0;      DECLARE in_job_id_2 char(50);      DECLARE in_action_2 char(50);      SET in_job_id_2 = CONCAT('"', in_job_id, '"');      SET in_action_2 = CONCAT('"', in_action, '"');      SELECT sum((case when end_time > 0 then end_time else unix_timestamp(now()) end) - start_time) AS job_times INTO out_times      FROM t_worker_timeline WHERE job_id COLLATE=utf8mb4_unicode_ci=in_job_id_2 AND action COLLATE=utf8mb4_unicode_ci=in_action_2 AND status=1 GROUP BY job_id;      RETURN (out_times);END;$$DELIMITER ;

来源：https://www.cnblogs.com/jianzhaojing/p/11685171.html